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Liquid nitrogen is nitrogen gas that has been cooled to liquid form. In medicine, it is commonly used to freeze and remove warts and cancerous cells, and in computers, it is used as a coolant.

Liquid nitrogen is also used in cooking. Modern chefs use it to freeze food, like strawberries, and then smash them and use the powder in creative ways. Bartenders use it to cool drinks or glasses or to take advantage of the fact that it becomes a fog when it is exposed to air.